Gradient Panel : Panel « Swing Components « Java
Gradient Panel
/*
* soapUI, copyright (C) 2004-2009 eviware.com
*
* soapUI is free software; you can redistribute it and/or modify it under the
* terms of version 2.1 of the GNU Lesser General Public License as published by
* the Free Software Foundation.
*
* soapUI is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
* even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU Lesser General Public License for more details at gnu.org.
*/
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.LayoutManager;
import java.awt.Paint;
import javax.swing.JPanel;
/**
* Created by IntelliJ IDEA.
*/
public class GradientPanel extends JPanel
{
// ------------------------------ FIELDS ------------------------------
public final static int HORIZONTAL = 0;
public final static int VERTICAL = 1;
public final static int DIAGONAL_LEFT = 2;
public final static int DIAGONAL_RIGHT = 3;
private int direction = HORIZONTAL;
private boolean cyclic;
private int maxLength;
// --------------------------- CONSTRUCTORS ---------------------------
public GradientPanel()
{
this( HORIZONTAL );
}
public GradientPanel( int direction )
{
super( new BorderLayout() );
setOpaque( false );
this.direction = direction;
}
public GradientPanel( LayoutManager layoutManager )
{
super( layoutManager );
setOpaque( false );
this.direction = HORIZONTAL;
}
// --------------------- GETTER / SETTER METHODS ---------------------
public int getDirection()
{
return direction;
}
public void setDirection( int direction )
{
this.direction = direction;
}
public boolean isCyclic()
{
return cyclic;
}
public void setCyclic( boolean cyclic )
{
this.cyclic = cyclic;
}
public void setMaxLength( int maxLength )
{
this.maxLength = maxLength;
}
// -------------------------- OTHER METHODS --------------------------
public void paintComponent( Graphics g )
{
if( isOpaque() )
{
super.paintComponent( g );
return;
}
int width = getWidth();
int height = getHeight();
// Create the gradient paint
GradientPaint paint = null;
Color sc = getForeground();
Color ec = getBackground();
switch( direction )
{
case HORIZONTAL :
{
paint = new GradientPaint( 0, height / 2, sc, width, height / 2, ec, cyclic );
break;
}
case VERTICAL :
{
paint = new GradientPaint( width / 2, 0, sc, width / 2, maxLength > 0 ? maxLength : height, ec, cyclic );
break;
}
case DIAGONAL_LEFT :
{
paint = new GradientPaint( 0, 0, sc, width, height, ec, cyclic );
break;
}
case DIAGONAL_RIGHT :
{
paint = new GradientPaint( width, 0, sc, 0, height, ec, cyclic );
break;
}
}
if( paint == null )
{
throw new RuntimeException( "Invalid direction specified in GradientPanel" );
}
// we need to cast to Graphics2D for this operation
Graphics2D g2d = ( Graphics2D )g;
// save the old paint
Paint oldPaint = g2d.getPaint();
// set the paint to use for this operation
g2d.setPaint( paint );
// fill the background using the paint
g2d.fillRect( 0, 0, width, height );
// restore the original paint
g2d.setPaint( oldPaint );
super.paintComponent( g );
}
}
